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Issue 12, 2012
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Effect of magnesium oxide on adsorption of Cd2+ from aqueous solution

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Abstract

Mesoporous MCM-41 was functionalized using magnesium nitrate hexahydrate (denoted as MM). The adsorption behavior of Cd2+ on functionalized MCM-41 was investigated systematically. The adsorption isotherms of MM for Cd(II) could be described by the Langmuir isotherm model. The adsorption rates were very high and agreed well with pseudo second-order kinetics. The modified MCM-41 adsorbent displayed excellent Cd2+ adsorption efficiency (210.96 mg gāˆ’1) and the residual concentration of Cd2+ achieved was in line with drinking water quality standards. The regeneration capacity maintained 99% performance when the initial solution concentration was 5 mg Lāˆ’1 (5000 ppb) at the eighth cycle, meeting the safe regulatory discharge standard for the first time. Furthermore, regeneration by an ultrasonic cleaning method to remove residual surface Cd2+ can reduce both the cost of traditional desorption agents and damage to the structure of the adsorbent. Therefore, the adsorbent MM has potential as a promising application in the field of water pollution control.

Graphical abstract: Effect of magnesium oxide on adsorption of Cd2+ from aqueous solution

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Publication details

The article was received on 05 Mar 2012, accepted on 07 Mar 2012 and first published on 08 Mar 2012


Article type: Paper
DOI: 10.1039/C2RA20394D
Citation: RSC Adv., 2012,2, 5178-5184
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    Effect of magnesium oxide on adsorption of Cd2+ from aqueous solution

    Z. Zhu and W. Li, RSC Adv., 2012, 2, 5178
    DOI: 10.1039/C2RA20394D

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